find he inverse of matrix A and verify
A= 1 -1 2
2 -3 -5
-1 3 5
I gave you this link yesterday explaining very nicely how to find the inverse
http://www.wikihow.com/Inverse-a-3X3-Matrix
A= 1 -1 2
2 -3 -5
-1 3 5
http://www.wikihow.com/Inverse-a-3X3-Matrix